Apple's new iPhone 4 stole the headlines this week, but it wasn't the company's only big news coming out of its Worldwide Developers Conference. On Monday, Apple also officially released the Safari 5 Web browser for both Mac and Windows users.

The new Safari 5 browser debuts as competition in the market for new browsers using the latest HTML5 technologies continues to heat up. Google (NASDAQ: GOOG) recently released Chrome 5, while Mozilla Firefox is nearing its 3.6.4 release. In the meantime, Microsoft is working on IE 9.